[LU-4660] fix osd_bufs_get() error handling

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.7.0
• Labels: patch
• Severity: 3
• Assignee: Bob Glossman (Inactive)
• Reporter: Andriy Skulysh

Description

Need to unlock just locked pages during cleanup. Otherwise they will be locked forever. ofd_preprw_read/ofd_preprw_write doesn't add them to the locked count.